基于两级Smith预估的纯滞后系统串级模糊控制仿真

Simulation of Cascade Fuzzy Control Method for Pure Lag System Based on Two Level Smith Predictors

在工业过程中,纯滞后系统普遍存在。针对副回路中含有纯滞后的串级控制系统,对典型的PID串级控制系统加以改进,提出基于主副回路Smith预估补偿的串级模糊控制方法,在主副回路分别加入Smith预估器,并利用模糊控制器为主调节器。仿真结果表明,该种控制方法相比传统的PID串级控制方法具有更优的动态特性和鲁棒性。

The large time-delay systems widely exist in industry process. For the pure lag which exists in the inner loop of cascade control systems, the cascade fuzzy control method based on Smith predictors is proposed. Two different Smith predictors are added in the main and inner of the system separately and Fuzzy controller is used as the main controller. Simulation result shows that the proposed method is much better than the traditional PID cascade control method in dynamic performance and robustness.